package collection;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;

public class CoiiectonDemo2 {
    public static void main(String[] args) {
       //Collection c= new ArrayList();
        Collection c= new HashSet();
        c.add(new point(1,2));
        c.add(new point(3,4));
        c.add(new point(5,6));
        c.add(new point(7,8));
        c.add(new point(9,0));
        c.add(new point(1,2));
        System.out.println(c);

        point p =new point(1,2);

        boolean contains= c.contains(p);
        System.out.println("是否包含:"+contains);

        c.remove(p);
        System.out.println(c);
    }
}
